Summary

My grandad had a very handy tool laying around, a so called: Kell Centerfinder.It's a little tool that lets you determine the exact center of a round object.

How to use it?
Just place the two 'pins' against the edge of a round object and draw a line. Than turn it about 90 degrees and draw another line. There you go! You should have a cross at the precise middle of your object.

Print Settings

Rafts:

No

                                            <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.1 or 0.2 layerheight should be fine</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>about 100%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Some printers should require a little brim to prevent the item from curling up.<br>I printed this in PLA and it works really well.</p><p>After the print is done, place two m4 (or any other format) screws in the tho holes. Make sure you use screws with nice straight heads like the ones in the pictures. </p></div>